Make £45 pure profit in 10 minutes time.
PayDayUK offer quick and easy loans, but their prices are quite steep (for every £100 you borrow they charge £20-£25, so i would not recommend them as a lender).
However, Quidco to the rescue. New loan applications receive £65 cashback.
So apply for the minimum loan of £80, pay back £100 and earn £65 from Quidco.
80 - 100 = -20
-20 + 65 = +45